Continuous apparatus working with drawn or blown blast or gas



Aug. 26, 1930. A. 0. H. FAssoTT;

CONTINUOUS APPARATUS WORKING WITH DRAWN OR BLOWN BLAST OR GAS Filed July 9, 192a Patented Aug. 26, 1930 some heir news at semint communes name won-arise e? inaawn ea eigenstates-r193. GA

' 1 Application are-dail 9, 1-9as, se;'-ia1n Thisi-nv-ention relates to continuous iappa; rat-us Workingwith drawn on blown blast on gas, and itsobject isto remedy the absencefof tight-joint fit of these apparatuses;

Theinvention consists in a continuous ap par-atu s with movable jointsjworkingwith drawn er -blown "blaster gas, rhaving two.

or several movable joints, placed jnsuch a ma-nnerxastoleaviea space or chamber be:

10 tween two successivejoints," and'means for maintaining inside the-said space a pressure substantially equal; tothat existing. 1n the suction or blowing box of the apparatus,

The suction orblowingehox is thus protected againstairadmissi onsor leakagespf -The=said space .or chamber. is connected with a suction an the discharge eoit which is controlled by a regulating xdegvice which can open or close :the outlet pipe .of the :f-an to a. variable extent according asthe amount of pressure in the space comprised between the two joints ptends to increase or decrease relatively to the amount of pressure which exists-in the suction box. .Thus,1evlen if the joint separating the said chamber ifrom'rthe suction *boxais of an imperfect tight 'pfit, the gaseous exchanges: between the suction; 300: and the chamber are'gtheoretinally and in practice only verysmsnland depend only on the sensitivity of the regulating adevicc. Th6 regulating device is, of course, rte-The, 00nstructed. of extreme sensitivity.-

The amount of air drawn and afterwards sent into the free air depends soleyon the degree of tightefit-ofrthe jqint' -whichisepa rates the chamber fromrthe outside atmQB phere and on theservice pressure :to be tained inside the i said chambe s In :ease that there is :high leakage of the joint and that the difference between the. se vice pre sure and the atmospheri pr ssu e is; great, the said amount be snlfi ien ly imp r ant to involvean;appreciable-.consumptioniof rho: tive power, but in ne ca ewill there .be t dilution'of the :ga esof the u tion box. 13 second joint which te ms a limit 0 thesaid cha ber is p ced ini uch a manner that it shall be a tempera-tare-appr achinglahe su o nding emperatu and thust can he previdedwwith devic s-Which red ce-the.

2 1,411, nd a n i umfgru y ao, -1e27. 3

scribed hereinafter by .WELYOQE example;

In thesaccompan-yingi drawings, lx i'l lust-rates diagrammatically a "nertical haliie section perpendicular to :theaxis of aDwighte Lloyd apparatus.

Fig. 2 is a section oi? the regulating device hereinafter referred to and Fig. '3 is; a vertica'lsection made along the axis of part of'a machine according itothe present invention. V 1

, Referring to Fr'g. '1, 1: is "the outside wall of one of the movahle .carriersywhich are placed one a-Eteranother and term thus the movable grate on which-is effected the roastingand the vsintering of the material. -2is one ofthe bars of the :gu'ate' .3 isihelayer of material to he roasted andsintered, incie dent :to the suction maintained in the 110- tion box A shownin part in the drawing :5. is the upper-portion of said suctionlbox pro-1 vided on one side with .a gfirst joint .6, vof any type'and showniin'tl ie drawing as having the tormot a sheet, :Which may :be'made of as: bestos or other suitable ,m-ate'ria'l,-pressed against the Wall of 1, and provided at (with a flanged extension on which is bolted ameniber 8 intended1to formthe second oint, with insertion of asbestos or other:non-heat'fcorn ducting substance. The carrier '12 .has :,-also -;a v flange :on which is bolted, with interposition of a joint :Whichis bad'conductor of :heat, themseoond piece 29 of-the joint. f "{l'lhe mem:

bers 8 andu9 which form the joint penetrate srar te Irlae ie mater als renewed tram. til-m to te ses by me s a pressure lubricator 10 which communicates with the joint through a series of small channels 11. The joints of asbestos, which, separate the members 8 and 9 from the carrier 1 and from the suction box 4, prevent a transmission of heat by conductivity, which transmission of heat would be harmful to the consistencyor to the preservation of the plastic material used. The chamber 12 thus limited between f The movable flap 15' (seeFigure 2) is fixed on'the axle 2O carrying two identical discs 21-21.,' Thewhole arrangement: flap valve, axle and discs, is carefully balanced and is supported byball bearings 2222 or,

any other device giving a mini-mum of fric- The bells 16,i17 strictly identical to tion. each other are each suspended by a flexible wire fixed in an identical manner to the corresponding belland each disc is immersed in a bath of Water or other liquid strictly main tained .at the same level, for instance by a connection 23. From. the: perfect symmetry of the device, any difference of pressure between the chamber 12 andthe box 4 breaks the equilibrium between the twobells 16 and 17 and causes the rotation of the flap valve 15 in one direction or the otherto cause a variation in the discharge of the fan such as to re-establish the equilibrium of pressure between the chamber 12 and thebox 4.

vUnder these conditions, the equilibrium of pressure between the chamber12 and the box 4will be always maintained, provided, of course, that the joint .89 and the fan 14 are chosen so that the, joint 8.9 shall never leak under the normalservice pressure, a

volume of air'higher than what the fan 14 can evacuate. g I

- The sensitivity of the system should be so regulated that the apparatus shall enter into operation as soon as the difference of pressure betweenthe chamber 12 and thebox 4 ex- 'eeeds an appreciable amount, for instance mm. of'water. This result is attained by giving large dimensions to the bells, by mak- 7 ing them withthin walls and by avoiding all possible. friction in the rotation of the axis of the flap valve, or any other friction.

The ends of the chamber 12, which are parallel to the section shown in Figure 1, are suitably closed bymeans such as metallic blocks the profile of which is identical with that of the empty space of the'chamber 12 and which with the Wall 198 of the carrier which is displaced, will permit only very small amounts. of air to enter the chamber 12. In order to obtain the same chamber of equilibrium on the small sides of the suction box of the apparatus as on the long sides, it is necessary to replace the two sliding joints 8 and 9 shown in Figure 1 by the rotating joints shown in Figure13. Y H In this Figure 3, 25 is the end of the suction box (called 4 in the diagram 1), 32, 33 is a horizontal'table placed exactly at-the level of the lower edge of the grate bars 2, 2. Under this table, 32, 33'and integral with it, is provided a box 24. In this box 24 rotate a certain number of toothed pinions 26 K box 24 is filled with water or any other liquid till about the height of the axes of the pinions. 30 is an emptying pipe for the box 24; it serves at the same time to feed fresh waterfor maintaining the level, or if necessity arises, for avoiding an excessive elevation of the temperature. Lastly, between two of these pinions, is provided the chamber 31 which acts in the same manner as the chamber 12 of the diagram 1.

'VVhen the grate bars are displaced upon the table 32, 33, they meet the pinions 26 and cause their rotation by acting upon them in the manner of a rack. The contact of the bars with the teeth of the pinions and the moderate pressure which they exercise upon I the resilient cushions 29 ensure a good tight joint fit and prevent admission of the air which-would have a tendency to come from 33 towards 32, owing to the vacuum existing in the suction box 25.

The chamber'31 is maintained by the device described in Fig. land Fig. 2, at the same pressure as the box25.

' I claim:

1. A sintering machine having movable pallets displaced over a suction box, at least two distinct successivesealing joints adapted to shut off the suction box from the atmosphere, a fan, means for connecting the space comprised between the said successive sealing joints with the fan, and means for regulating the action of the fan so that the pressure inside the said space shall be substantially the same as that in the suction box.

2. A sintering machine having movable pallets displaced over a suction box, at least two distinct'sucessive sealing joints adapted to shut-01f the suction box from the atmosphere, a fan, means for connecting the space comprised between the "said successive sealing joints with the fan and a regulating device for automatically regulating the action of the fan, whereby the pressure in thespace,

between the successive sealing joints as controlled by the fan will be'substantially the same as the pressure in the suction box.

3. A sintering machine having movable pallets displaced overa suction box, at least two distinct sucessive sealing joints adapted to shut 013? the suction box from'the atmosphere, a fan, means for connecting the space comprised between the said successive sealing joints with the fan and a regulating device for'automatically regulating the action of the fan, said device being controlled by the relative pressures in the space between the sealing joints and in the suction box and serving to insure that the pressure developed by the fan in said space will be substantially the same as in the suction box, and means for protecting one of the sealing joints against radiation and conduction of heat, as and for the purpose set forth.

4. A sintering machine having movable pallets displaced over a suction box, at least 7 two distinct sucessive sealing joints adapted to shut off the suction box from the atmosphere, a fan, means for connecting the space comprised between the said successive sealing 1 tion box, and means for protecting one of the sealing joints against radiation and conduc joints with the fan, a regulating device for automatically regulating the action of the fan to maintain the pressure developed by the fan in the space between the sealing joints substantially the same as the pressure in the suction of heat, said means comprising two ser rated members which slide upon each other and between which a'plastic material isfed, one of the serrated members being fixed to the movable pallet with interposition of substance non-conductive of heat.

5. A sintering-rnachine having movable pallets, displaced over a suction box, at least two distinct successive sealing joints adapted Y to shut ofi the suction box from the atmosphere, a fan, means for connecting the space comprised between the said successive sealing joints with the fan, a flap valve for regulating the discharge of the fan and capable of moving around a shaft, two hydraulic bells, the interior of one hydraulic bell being connected with the suction box, while the interior of the other hydraulic bell is connected with the space between two distinct sealing joints, and means for operating the shaft of the flap valve from the hydraulic bells. ADOLPHE DENIS HENRI LEON FASSOTTE. I 

